Cisco Catalyst 4948 10 Gigabit Ethernet Switch
Cisco Catalyst 4948 10 Gigabit Ethernet Switch
Cisco Catalyst 4948 10 Gigabit Ethernet Switch
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Data Sheet<br />
Predictable Performance and Scalability<br />
The <strong>Cisco</strong> <strong>Catalyst</strong> <strong>4948</strong> <strong>10</strong> <strong>Gigabit</strong> <strong>Ethernet</strong> <strong>Switch</strong> is optimized for multimedia applications with its advanced<br />
multicast support. It supports Protocol Independent Multicast (PIM), Source-Specific Multicast (SSM), and Pragmatic<br />
General Multicast (PGM), providing end users with additional scalability to support multimedia applications. Also<br />
supported is Internet Engineering Task Force (IGMP) snooping in hardware, enhancing performance and reducing<br />
network traffic by allowing a switch to dynamically add and remove hosts from a multicast group.<br />
Intelligent Network Services with QoS and Sophisticated Traffic Management<br />
The <strong>Cisco</strong> <strong>Catalyst</strong> <strong>4948</strong> <strong>10</strong> <strong>Gigabit</strong> <strong>Ethernet</strong> <strong>Switch</strong> offers superior per-port QoS features to help ensure that<br />
network traffic is classified, prioritized, and scheduled optimally to efficiently manage bandwidth-hungry multimedia,<br />
and time-sensitive and mission-critical applications. The <strong>Catalyst</strong> <strong>4948</strong> <strong>10</strong> <strong>Gigabit</strong> <strong>Ethernet</strong> <strong>Switch</strong> can classify,<br />
police, and mark incoming packets, allowing the administrator to differentiate between traffic flows and enforce<br />
policies. Sharing, shaping, and strict-priority configurations determine scheduling of egress traffic. The <strong>Catalyst</strong> <strong>4948</strong><br />
<strong>10</strong> <strong>Gigabit</strong> <strong>Ethernet</strong> <strong>Switch</strong> also supports Dynamic Buffer Limiting (DBL), a congestion-avoidance feature. For details<br />
about the QoS features (including DBL) on the <strong>Cisco</strong> <strong>Catalyst</strong> <strong>4948</strong> <strong>10</strong> <strong>Gigabit</strong> <strong>Ethernet</strong> <strong>Switch</strong>, refer to the <strong>Cisco</strong><br />
<strong>Catalyst</strong> 4500 Series supervisor engine QoS overview at<br />
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_white_papers_list.html.<br />
Features and Specifications at a Glance<br />
Layer 2 Features<br />
● Layer 2 hardware forwarding at <strong>10</strong>2 mpps<br />
● Layer 2 switch ports and VLAN trunks<br />
● IEEE 802. 1Q VLAN encapsulation<br />
● Inter-<strong>Switch</strong> Link (ISL) VLAN encapsulation<br />
● Dynamic Trunking Protocol (DTP)<br />
● VLAN Trunking Protocol (VTP) and VTP domains<br />
● Support for 4096 VLANs per switch<br />
● PVST and PVST+<br />
● Flexlink<br />
● Spanning Tree PortFast and PortFast Guard<br />
● Spanning Tree UplinkFast and BackboneFast<br />
● IEEE 802.1s<br />
● IEEE 802.1w<br />
● IEEE 802.3ad<br />
● Spanning Tree Root Guard<br />
● <strong>Cisco</strong> Discovery Protocol Versions 1 and 2<br />
● IGMPv1, v2, and v3 snooping<br />
● <strong>Cisco</strong> EtherChannel technology, <strong>Cisco</strong> Fast EtherChannel technology, and <strong>Cisco</strong> <strong>Gigabit</strong> EtherChannel<br />
technology<br />
● Port Aggregation Protocol (PAgP)<br />
● Link Aggregation Control Protocol (LACP)<br />
● Unidirectional link detection (UDLD) and aggressive UDLD<br />
© 2009 <strong>Cisco</strong> Systems, Inc. All rights reserved. This document is <strong>Cisco</strong> Public Information. Page 4 of 17
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